Motorcycle engine valve key press-mounting device

The utility model discloses a motorcycle engine valve key press-mounting device. A turnover plate is rotatably arranged on a rotation shaft in a sleeved mode, a pushing rod can slide up and down in an operation table, the operation table is provided with a rotation handle linked with the pushing rod, a locating pin is arranged in the center of the turnover plate, and a backstop block is arranged on the turnover plate. Screw rods are vertically arranged in two supporting blocks in a penetrating mode respectively and drive the supporting blocks to move up and down, corresponding screw rod rotation grooves are formed in the operation table, corresponding threaded holes are formed in the two supporting blocks, the bottoms of the two screw rods penetrate into the operation table, and gears are arranged on the side walls of the screw rods in a sleeved mode respectively. The two gears are connected with the operation table in a clamping mode and located in the operation table in a rotating mode, lead screws meshed w